Add-ons
Message Composition
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*cloud - FileLink for Nextcloud and ownCloud
Upload large attachments to your Cloud and send the link by email
29,087 users -
SmartTemplates
SmartTemplates offers an easy and powerful way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every mail identity, Stationery files can now be imported and used directly.
5,870 users
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.97,426 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft67,533 users -
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.49,700 users -
Switch the signature on/off or choose a new one from your predefined set.48,728 users -
Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).47,960 users -
Check your emails for spelling and grammar issues39,773 users
Top Rated See all »
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Check that number of non-BCC recipients does not exceed a parameter.739 users -
Highlights selected text when composing emails. Default colour is yellow - other colours are available via Options.
(Works only during writing an e-mail, i.e. only in the compose window.)12,964 users -
Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.21,263 users -
Quickly choose one of the previously selected colors for a message text1,412 users -
Upload large attachments to your Cloud and send the link by email29,087 users -
Thunderbird は Outlook のようにアドレス全選択からの「一括コピー」ができません。
それを実現するためのアドオンです。855 users
Recently Added See all »
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Rewrite or generate text based on promps using OpenAI's API.
Configure on settings page (make sure to save) and start to use when writing your emails!
You must have API key for OpenAI (anyone can access GPT-3.5-turbo).
GPT is multilingual!49 users -
Encrypt any file, any text, and share via any medium, any time24 users -
Modern encryption in Thunderbird - powered by Rust, rage and WebAssembly7 users -
Dieses Plugin setzt automatisch die KIM-Header und den Betreff passend zu ihrem Anhang.
Anhängen werden analysiert und falls genau eine valide p7s Datei erkannt wird, werden die entsprechenden Daten automatisch gesetzt.38 users -
SpamTester allows you to test the spam score of your email using popular anti-spam software (SpamAssassin, Rspamd...). This is useful to know if your email will fall into the recipient's spam (or even get your mail server blocked).80 users
See all 187 extensions in Message Composition »
To create your own collections, you must have a Mozilla Add-ons account.
